Process mechanism on catechol degradation by Fe3+/H2O2 oxidation system
Fe3+/H2O2 oxidation system was developed in this study to explore catechol degradation effect in water.The oxidation performances of this system under different reaction conditions were examined,its mechanism was investigated through electron paramagnetic resonance(EPR),reactive oxidation species(ROS)scavenging experiment,and quantum chemistry theoretical calculation.The results showed that catechol could be degraded by Fe3+/H2O2 system efficiently under mild acidic conditions,EPR and scavenging tests results indicated that large amounts of alkyl radicals besides hydroxyl radicals were produced.Electron spectroscopy analysis revealed a weak-field coordination complex occurred between catechol and Fe3+during degradation,which could inhibit Fe3+hydrolysis under mild pH conditions and further promote Fe(Ⅱ)-Fe(Ⅲ)-Fe(Ⅱ)redox cycling through charge transfer from ligand to metal,and thereby accelerating its self-degradation.Fe3+/H2O2 oxidation system could significantly enhance the degradation efficiency of coexisting organic compounds.This work provides a novel approach to face facile hydrolysis of iron and low redox cycling in Fenton process.
catecholFenton reactioncatalysis promotercoordination chemistryreactive oxidation species
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